The effect of momentum source on AV flow and concentration

october · June 10, 2011, 20:01

Hi,

I solve a diffusion only problem (generation of a component using a source term @ a wall boundary and diffusion of the component in fluid domain then to solid domain and in the solid domain there is a rxn ( kind of adsorption) expressed as a sink (using sub domain) and source for a component formed in the rxn. I used additional variable (AV) as a diffusing component and all works fine. But, when the same problem turned to a convective diffusive problem (by adding a momentum source (general momentum source with x component only) to represent an internal fan contained in the fluid domain) the concentration level that cfx reported looks messed (physically unexpected). what is the matter? I tried to use a converged steady state solution of the momentum and turbulence as an initial value for my transient problem, the execution goes okay but the answer I got concerning the concentration level in the fluid phase and in the solid phase looks not correct.

ghorrocks · June 11, 2011, 08:46

Can you post some images of what you are modelling?

october · June 27, 2011, 05:48

Hi ghorrocks, sorry for my absence, due to some problem I was not around my work last week. Thanks so much for your interest on my problem. I post the geometry of my modelling as a profile.

ghorrocks · June 27, 2011, 07:01

The delay does not worry me, no need to apologise.

I cannot see the geometry you have posted. Where have you put it?

october · June 28, 2011, 03:56

Okay, will not apologies again, haha...don't know why the post is not visible...let me try again. Look below. the wall bisecting the fan and the AV generator is type symmetry.

october · June 28, 2011, 03:59

June 10, 2011, 20:01	The effect of momentum source on AV flow and concentration	#1
october New Member AlemayehuA Join Date: Oct 2010 Posts: 7 Rep Power: 16	Hi, I solve a diffusion only problem (generation of a component using a source term @ a wall boundary and diffusion of the component in fluid domain then to solid domain and in the solid domain there is a rxn ( kind of adsorption) expressed as a sink (using sub domain) and source for a component formed in the rxn. I used additional variable (AV) as a diffusing component and all works fine. But, when the same problem turned to a convective diffusive problem (by adding a momentum source (general momentum source with x component only) to represent an internal fan contained in the fluid domain) the concentration level that cfx reported looks messed (physically unexpected). what is the matter? I tried to use a converged steady state solution of the momentum and turbulence as an initial value for my transient problem, the execution goes okay but the answer I got concerning the concentration level in the fluid phase and in the solid phase looks not correct.

June 27, 2011, 05:48		#3
october New Member AlemayehuA Join Date: Oct 2010 Posts: 7 Rep Power: 16	Hi ghorrocks, sorry for my absence, due to some problem I was not around my work last week. Thanks so much for your interest on my problem. I post the geometry of my modelling as a profile. Last edited by october; June 27, 2011 at 06:28. Reason: images not properly posted

June 28, 2011, 03:56		#5
october New Member AlemayehuA Join Date: Oct 2010 Posts: 7 Rep Power: 16	Okay, will not apologies again, haha...don't know why the post is not visible...let me try again. Look below. the wall bisecting the fan and the AV generator is type symmetry. Last edited by october; June 28, 2011 at 04:05. Reason: To add picture

June 28, 2011, 03:59		#6
october New Member AlemayehuA Join Date: Oct 2010 Posts: 7 Rep Power: 16	Last edited by october; July 12, 2011 at 09:51. Reason: remove

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June 11, 2011, 08:46		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Can you post some images of what you are modelling?

June 27, 2011, 07:01		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	The delay does not worry me, no need to apologise. I cannot see the geometry you have posted. Where have you put it?